Is there a type of jelly substance around the eggs? or are you seeing tiny moving snails? There is one other thing that resembles your description and it is something called freshwater limpets. They are a type of mollusk, and they are harmless.
Refer to my suggestions on post #2 about their removal. But really, they won't harm your tank or fish.
Refer to my suggestions on post #2 about their removal. But really, they won't harm your tank or fish.